Synthesis method and application of nano-titanium dioxide for adsorption of heavy metals

A nano-titanium dioxide, heavy metal adsorption technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of small adsorption capacity, difficult heavy metal regeneration, short service life, etc. Effect

Active Publication Date: 2011-06-01
XIAN ENVIROMENTAL PROTECTION IND TRADE
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Problems solved by technology

Although iron oxide in the above adsorption materials can remove heavy metal ions, the removal efficiency of other heavy metals is low and the adsorption capacity is not large; although activated carbon can be used for the common removal of various heavy metals, the adsorption capacity is not ideal, and the two The common disadvantages of adsorbents are short service life and difficulty in regeneration after adsorption of heavy metals is saturated.

Method used

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  • Synthesis method and application of nano-titanium dioxide for adsorption of heavy metals
  • Synthesis method and application of nano-titanium dioxide for adsorption of heavy metals
  • Synthesis method and application of nano-titanium dioxide for adsorption of heavy metals

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preparation example Construction

[0029] 1. the preparation method of heavy metal adsorbent of the present invention is as follows:

[0030] (1) The reaction vessel is placed in an ice-water bath;

[0031] (2) Add water to the reaction vessel, and control its temperature between 6~10°C;

[0032] (3) Add titanyl sulfate under stirring, and dissolve evenly;

[0033] (4) Add sodium hydroxide solution drop by drop under high-speed stirring, adjust the pH value of the solution to 5.5-6.5, the optimal value is 6.0, continue the reaction for several minutes, wash the obtained precipitate with water, and filter it several times until the conductivity is 100μs Below, to remove sulfate;

[0034] (5) After the filter cake is dried at a temperature lower than 60° C., it is crushed, sieved and packaged to obtain the product nano-titanium dioxide adsorbent.

Embodiment 1

[0036] Place the reaction vessel with a volume of 10L in an ice water environment, add 1600mL of deionized water, keep the water temperature at 6-10°C, take 300g of titanyl sulfate and slowly add it into the deionized water, stir evenly, and then use a constant flow pump to 10 ml of sodium hydroxide solution with a concentration of 10 M was added dropwise to adjust the pH value to 5.9. The above solution was washed several times with deionized water until the conductivity dropped to 76 μs, and the filtered precipitate was dried at 60° C., pulverized and sieved to obtain 110 g of the product.

Embodiment 2

[0038] Place the reaction vessel with a volume of 2L in an ice water environment, add 250mL of deionized water, keep the water temperature at 6-8°C, take 50g of titanyl sulfate and slowly add it into the deionized water, after stirring evenly, use a constant flow pump to Add 5M sodium hydroxide solution at a rate of 10 ml. When the pH reaches 3.0-3.5, increase the stirring speed, and reduce the dripping speed of the sodium hydroxide solution to control the pH value, and adjust the final pH value to 6.0. The above solution was washed with water several times until the conductivity dropped to 64 μs, and the precipitate obtained after filtration was dried at 60° C., pulverized and sieved to obtain 22 g of the product.

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Abstract

The invention provides a synthesis method and application of nano-titanium dioxide for adsorption of heavy metals. Titanyl sulfate is put in a certain amount of water for dissolving, diluting, regulating pH value and washing so as to obtain the metatitanic precipitation. After the solid-liquid separation, the precipitation is dried at a certain temperature, grounded, sifted to get the titanium dioxide adsorbent. The adsorption experiments show that the adsorbent has a strong adsorption capacity in solution of Pb2 +, Cd2 +, Cu2 +,AsO43- and other heavy metal ions and the synthesis method can be used for purifying waste water containing high concentrations of heavy metals.

Description

1. Technical field [0001] The invention relates to a preparation method of a heavy metal adsorbent, belonging to the technical field of wastewater treatment. 2. Background technology [0002] From the perspective of environmental pollution, heavy metals mainly refer to mercury, lead, cadmium, chromium and other metals with significant biological toxicity and metalloid arsenic, as well as copper, cobalt, nickel, tin, vanadium and other metals with certain toxicity. In recent years, due to the substandard discharge of wastewater from various industries (such as mining, smelting, electroplating, etc.) and the pollution of water bodies by solid waste seepage, the content of heavy metals in water bodies has remained high. At present, the most attention is mercury, lead, cadmium, chromium, copper and arsenic, etc., because these heavy metal ions can only change forms or be transferred, diluted and accumulated in the environment, but cannot be degraded, thus causing great harm to h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 崔金立罗婷景传勇
Owner XIAN ENVIROMENTAL PROTECTION IND TRADE
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